add MoneroUtils.getPaymentUri(config)

woodser · Apr 25, 2024 · 007a199 · 007a199
1 parent bfa0922
commit 007a199
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diff --git a/src/main/java/monero/common/MoneroUtils.java b/src/main/java/monero/common/MoneroUtils.java
@@ -9,6 +9,8 @@
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.net.URI;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
@@ -21,6 +23,7 @@
 import monero.wallet.model.MoneroAddressType;
 import monero.wallet.model.MoneroDecodedAddress;
 import monero.wallet.model.MoneroIntegratedAddress;
+import monero.wallet.model.MoneroTxConfig;
 import org.apache.commons.codec.binary.Hex;
 import org.bouncycastle.jcajce.provider.digest.Keccak;
 
@@ -587,6 +590,33 @@ public static double atomicUnitsToXmr(BigInteger amountAtomicUnits) {
     BigInteger[] quotientAndRemainder = amountAtomicUnits.divideAndRemainder(BigInteger.valueOf(AU_PER_XMR));
     return quotientAndRemainder[0].doubleValue() + quotientAndRemainder[1].doubleValue() / MoneroUtils.AU_PER_XMR;
   }
+
+  /**
+   * Creates a payment URI from a tx configuration.
+   * 
+   * TODO: use native bindings to monero-project
+   * 
+   * @param config specifies configuration for a payment URI
+   * @return the payment URI
+   */
+  public static String getPaymentUri(MoneroTxConfig config) {
+    if (config.getAddress() == null) throw new IllegalArgumentException("Payment URI requires an address");
+    StringBuilder sb = new StringBuilder();
+    sb.append("monero:");
+    sb.append(config.getAddress());
+    StringBuilder paramSb = new StringBuilder();
+    if (config.getAmount() != null) paramSb.append("&tx_amount=").append(atomicUnitsToXmr(config.getAmount()));
+    if (config.getRecipientName() != null) paramSb.append("&recipient_name=").append(urlEncode(config.getRecipientName()));
+    if (config.getNote() != null) paramSb.append("&tx_description=").append(urlEncode(config.getNote()));
+    if (config.getPaymentId() != null && config.getPaymentId().length() > 0) throw new IllegalArgumentException("Standalone payment id deprecated, use integrated address instead");
+    char[] paramChars = paramSb.toString().toCharArray();
+    if (paramChars.length > 0) paramChars[0] = '?';
+    return sb.toString() + (paramChars.length > 0 ? new String(paramChars) : "");
+  }
+
+  private static String urlEncode(String string) {
+    return URLEncoder.encode(string, StandardCharsets.UTF_8).replaceAll("\\+", "%20");
+  }
 
   // ---------------------------- NATIVE BINDINGS -----------------------------
 

diff --git a/src/test/java/TestMoneroUtils.java b/src/test/java/TestMoneroUtils.java
@@ -18,6 +18,7 @@
 import monero.wallet.MoneroWallet;
 import monero.wallet.MoneroWalletFull;
 import monero.wallet.model.MoneroIntegratedAddress;
+import monero.wallet.model.MoneroTxConfig;
 import monero.wallet.model.MoneroWalletConfig;
 import org.junit.jupiter.api.Test;
 import utils.TestUtils;
@@ -232,6 +233,17 @@ public void testAtomicUnitConversion() {
     assertEquals(new BigInteger("1250000000000").toString(), MoneroUtils.xmrToAtomicUnits(1.25).toString());
     assertEquals(1.25, MoneroUtils.atomicUnitsToXmr(new BigInteger("1250000000000")));
   };
+
+  @Test
+  public void testGetPaymentUri() {
+    MoneroTxConfig config = new MoneroTxConfig()
+        .setAddress("42U9v3qs5CjZEePHBZHwuSckQXebuZu299NSmVEmQ41YJZQhKcPyujyMSzpDH4VMMVSBo3U3b54JaNvQLwAjqDhKS3rvM3L")
+        .setAmount(MoneroUtils.xmrToAtomicUnits(0.25))
+        .setRecipientName("John Doe")
+        .setNote("My transfer to wallet");
+    String paymentUri = MoneroUtils.getPaymentUri(config);
+    assertEquals("monero:42U9v3qs5CjZEePHBZHwuSckQXebuZu299NSmVEmQ41YJZQhKcPyujyMSzpDH4VMMVSBo3U3b54JaNvQLwAjqDhKS3rvM3L?tx_amount=0.25&recipient_name=John%20Doe&tx_description=My%20transfer%20to%20wallet", paymentUri);
+  }
 
   // ---------------------------- PRIVATE HELPERS -----------------------------